Patent blue dyes
Patent blue dyes are acid dyes from the group of triphenylmethane dyes . There are dyes with a moderate to good alkali - and lightfastness that the dyeing and printing of wool and silk are used and also for non-textile use.
The common structural element of the patent blue dyes is a sulfonic acid group in the ortho position to the methine group , which gives them good alkali fastness. The first dye of this type was Patent Blue V , which was developed by Meister Lucius & Brüning , later Hoechst AG, in 1888 .
Representative
| designation | Color Index | Non-textile use |
|---|---|---|
| Patent blue V | Acid Blue 3 | Food coloring, coloring of toilet flushes / flush water |
| Patent blue VF | Acid Blue 1 | Vital coloring , cosmetic coloring, coloring of toilet flushes / flushing water |
| Patent blue AF | Acid Blue 7 | Cosmetic dye (limited) |
| Patent blue A | Acid Blue 5 | Cosmetic dye |
| Patent Blue IX or Patent Blue AE | Acid Blue 9 | Food coloring, coloring of toilet flushes / flush water |
Structures:
Individual evidence
- ↑ Entry on patent blue dyes. In: Römpp Online . Georg Thieme Verlag, accessed on April 27, 2020.
- ↑ K. Venkataraman (Ed.): The Chemistry of Synthetic Dyes . tape II . Academic Press, New York, London 1952, pp. 715 .
- ↑ a b Thomas Gessner, Udo Mayer: Triarylmethane and Diarylmethane Dyes . In: Ullmann's Encyclopedia of Industrial Chemistry . tape 37 . Wiley-VCH Verlag, Weinheim June 15, 2000, p. 425-478 , doi : 10.1002 / 14356007.a27_179 .